Good trick Endoskull. Would have done the same way had you not gone before me.
Here's the URL:
http://play.starwars.com/starwars_soundboard/asset/audio/TRPR_stormtroopers/storm_01.mp3Just change the last number from storm_01.mp3 to storm_02.mp3 and so on, up to 20.
If you're on linux or mac, just paste this in your terminal to download them all in one go.
for i in $(seq -w 20); do wget "http://play.starwars.com/starwars_soundboard/asset/audio/TRPR_stormtroopers/storm_$i.mp3";done